Communication-free control concept for operating a low voltage island grid

authored by

Iwo Bekker, Lutz Hofmann

Abstract

To ensure a communication-free island grid operation, a control concept has already been proposed in the literature. This control concept uses state machines implemented within smart meters at each household and makes use of grid-forming inverters having batteries and secondary control in grid-forming inverters. During an island grid operation, it is necessary to keep the state of charge of the batteries of the grid-forming inverters within a permitted band, otherwise, the grid-forming inverters will lose its primary energy source and can not form anymore the grid by a reference voltage. Besides that, it is also important to consider the rated power respectively the maximum current of the grid-forming inverters to prevent the semiconductors from damage. Measures have to be taken in cases of an overcurrent. It is a problem to limit the current of a grid-forming inverter when at the same time the grid power balance has to be fulfilled and other inverters are not able to support the overloaded grid-forming inverter due to their limited battery capacities. This publication gives a solution in the form of an extension of the already presented control concept of how to overcome this problem and validates that through an RMS simulation, carried out in PowerFactory.

Organisation(s)

Electric Power Engineering Section
Institute of Electric Power Systems

Type

Conference contribution

Publication date

2023

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Artificial Intelligence, Computer Networks and Communications, Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment, Electrical and Electronic Engineering, Safety, Risk, Reliability and Quality

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1109/ISGTAsia54891.2023.10372805 (Access: Closed)